So, most of the 18 years that my 225 Yamaha was on my boat, I ran one battery for the motor and one for the accessories. The accessories battery was charged by an isolated charge wire from the motor. Starting the motor had no effect on the electronics, unlike a friend’s boat that when he started his motor, it turned off his gps/ sonar unit. My cranking battery was hooked up directly to the motor and the accessories battery was wired to battery switch. I had a jumper cable to the switch as an emergency connect for both batteries. My cranking battery is rated at 1000 cca.
I got the boat back from dealer and noticed that the switch was on for both batteries. The only way to charge the second battery is to connect them, or start on the battery that really doesn’t provide enough for starting. I have been doing some research lately and from what I have read, the Suzuki 225 does not have an option for a separate charge wire. It seems as though the lowly 225 is the “plain Jane” model of the line. Maybe that explains how I was able to find a motor. I would really like to have a way to charge that battery without running the two batteries in parallel. It bothers me having two batteries that are different from each other hooked together.
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